Nondegenerate intervals of no-trade prices for risk averse traders

Gerd Hellmut Weinrich

Research output: Contribution to journalArticlepeer-review


According to the local risk-neutrality theorem an agent who has the opportunity to invest in an uncertain asset does not buy it or sell it short iff its expected value is equal to its price, independently of the agent’s attitude towards risk. Contrary to that it is shown that, in the context of expected utility theory with differentiable vNM utility function, but without the assumption of stochastic constant returns to scale, nondegenerate intervals of no-trade prices may exist. With a quasiconcave expected utility function they do if, and only if, the agent is risk averse of order one.
Original languageEnglish
Pages (from-to)79-99
Number of pages21
JournalTheory and Decision
Publication statusPublished - 1999


  • no-trade prices
  • portfolio choice
  • risk aversion of order one


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